After succeeding (with your help) in plotting meteo variables in single (one variable) graphs I'm trying to produce a panel with time series of the different variables in my data in a single panel, like the one in ggplot2 webpage example. I have tried to reproduce that example (the last graph at bottom of the page) with my data but without success

From the error it looks like you might have 'NA's in the 'value' column and this is causing qplot to hang when it tries to compute the bounds of your x-axis.
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ChrisOct 19 '11 at 12:07

@Chris When previously plotted a single variable in a single graph with ggplot I only needed to remove NAs (changing to 0) in the case of plotting precipitation with geom_bar(), not needed for geom_line. Maybe after melt command is it needed to remove NA? I've used melt as it was in the cited example
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pacometOct 19 '11 at 12:16

1 Answer
1

the issue is twofold. First of all there's no date object within the melted data.frame, which gives you the error message. Second, your FECHA.H_SOLAR is a factor which would make hard plotting the dates correctely. So here is my solution: